Manual

Pin
RS-232
RS-422
RS-485
1
DCD
TX-
Data-
2
RXD
TX+
Data+
3
TXD
RX+
N.C
4
DTR
RX-
N.C.
5
GND
No use
No use
6
DSR
No use
No use
7
RTS
No use
No use
8
CTS
No use
No use
9
RI
No use
No use
2.2.1 COM1&COM2 Connector
The COM1 and COM2 is a standard DB-9 connector. This connector is equipped with +5V level
power capability on DCD and +12V level on RI by setting JP10 and JP11. The pin assignment of
RS-232/RS-422/RS-485 is listed on the following table. If you need COM1 port to support RS-422
or RS-485 m ode, please refer to Jum per Settings
COM1(SBC87832)
1 5
6 10